Grinding machine



E, l.. HARLEY 2,669,074

' GRINDING MACHINE 3 Sheets-Sheet l al Y 1 g A .l

Feb. 16, 1954 Filed Dec,- 29, 195o 1 l x l l I L- IN V EN TOR Feb. 16,1954A E. l.. HARLEY 2,669,074

GRINDING MACHINE Filed Dec. 29, 1950 .'5 Sheets-Sheet 2 IN VEN TOR.

mi? Y Mk1-WM Feb, v16, 1954 E. l.. HARLEY GRINDING MACHINE 5Sheets-Sheet 3 Filed Dec. 29, 1950 s null .INS

. INVENTOR.

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vtypeffin which theA above and other objects as A Fig. lrepresentsanendelevation'of-'a machine tie 01 tache'd tof! the eccentricshaftgfthev carni actuating `sa-id =arrn; the `dr-ive; 4for thefcam ,andthepswitch actuated fbyfthezarm, and

Patented Feb. 16, 1954 Awirrati-T OFFICE 2,669,074 GRINDING MACHINEvE-arlciiL Harley, Brooklyn, N. Y. Appliatitecemuer 29, 195o; seriarNo.203;.2'13v 'awayfrom thegrinding roller, the feed, rate of grind,and'speedof rotationof the cylinder being automatically controlled.

yAnother"object is to producea grindinghmachine of 'the' charactervrdescribed viny which the adjustable" cylinder is automaticallystoppedwhenthe predetermined ar'no'untyof'y grindinghasbeeniaccomplish'edl Another object is to produce la machineof thecharacter described in whiclitheggrindinglsurd face .is maintained in aneven conditionby meansl of ana'utomatic tension'y deviceassociated withthe` strip of: abrasive material with which the grindingjroller isfurnished.

Another'obj ect is Ato produce: a machine vofthe character describedinwhich the: surfacev tobe ground or abraded'is adjustable withrespectto the' abrasive rolle'rduringrotation of the cylinder,supportn'gsaid surface.' l

A' furtherobject is v'to provide amachineofthis :zo will hereinafter bedescribed may 'be' attained.`

, Alpr'actical embodimentr of my invention is'replresented in theaccompanying drawings in which:

constructed according to my invention;

Fig: 2 represents a'front elevation,v partlybrokenaw'ay, ofthelformshown in Fig- 1.l

`Fig. v3 representsiarvertical longitudinal se'ctio'n takerion thelineIIIeLIII ofFig'.r l'looking inthe direction ofthe arrows;v

' resetsfapartialdetail setionftaken n 'IVfofFig3:10okingithidirecf"th"e arrow/si 5 represents l av detail "showing 'Contactv` ofBroadlym'y invention comprises a. grinding machine including means formaintaining the grinding surface under tension and other interrelatedmeans'fo'r controlling the grinding operation' through automatic controlof the cylinder supporting thearticle to be ground together with thedrivefor said cylinder.

Referring to theaccompanying drawings, the frame of the machineis' shownas comprising a lowercasting I supportingjan upper casting 2 which is'bolted thereon or otherwise secured thereto. Supportedinthejlower partof casting I are two motors 3fand4`of different horsepower whichprovideY a'drive' for various elements of the maclniine as willhereinafter be described. Situated on the same level as the motors is areductiongear 5 which is in turn connected to a reduction gearai'lxed tothe upper casting 2. The said upper casting is provided with the usualpillow blocks l, 8 whichare adapted to support the eccentric end's'g ofthe shaft 9. Ro'tatably supported on the shaft 9 are interior ballbearings II, I2 whichare secured in opposite ends of cylinder It. AAlsoa'ixed to the end of cylinder I I is a sprocket I3adapted to receive thechain I4, which is driven` by its connection with the sprocket I mounted,on the shaft I 6, which is the' output shaftof the lower reductiongear.

The'suppor'ting cylinder Ill is provided with scribemarks I'I, I8adjacent its ends in order'to vrdelirnit the surface to which thesurface to be ground may be afxed. These surfaces may be printing platesI9, of various materials or offset blankets. As shown in Fig. 2 rubberprinting plates are affixed so that their edges are not parallel to thecylinder axes by placing masking tape 2|, 22 across'the leading edges,the tail of the plate being'leld to the cylinder by a plurality of tabsdenoted'collectively by 23.

Mounted in parallelism with the longitudinal axis vof the cylinder IIlis a grinding roller provided an abrasive surface 25 held thereon,undertension as described in my'copending application' Serial No??203,314 filed December 29, 195o, new'Partanna-2,630,657, dated March 1o,

(1953i This'rollerZd is mounted on a shaft -26 .formed integraltherewith and shaped at 21 to accommodate" a belt 28 driven from thelarger motor 4l hereinabove described. The ends of shaft 26`o`ftheroller 24 are suitably journaled in mountings YZi'lfandtil bolted orotherwise secured to thetop o`fca`sting=2 as shown in Figs'. 1 andv 2.

Rotatably Vmounted beneath and in contact with the`oute'rsurfaceofcylinder I9 is the rotary'brush 3'I which is driven fromtheopposite ed ofthe" larger' motor 4 .byvvhich' the roller M is driventhrough its belt 32. It will be noted that the brush 3| and roller 24rotate in the same direction as the cylinder I and both the brush androller are rotated at a constant and the same speed. Beneath the brush3| I provide a receptacle 33, having three vertical sides uprising fromthe bottom, to receive the ground material and permit its removaltherefrom. This receptacle may be supported in any well known orapproved manner and is not ordinarily removable.

Attached to the outer end of casting 2 is a graduated scale 34 (shown inFig. 1) and having a pointer 35 adapted to co-act therewith, saidpointer being secured to a knob 36 carried by one of the eccentric ends9 of shaft 9.

Also connected to an eccentric end 9 of the shaft 9 is an arm 31 havinga split end 38 which enables it to be clamped to the shaft 9 by means ofa set screw 33. This arm extends laterally and terminates in a roller 40which is held in contact with the peripheral surface of an S shaped cam4| by means of a spring 42 connected to the said arm at one end and tothe casting at the other end by means of a rod or other connection 43.The arm 31 has an elbow 44 adapted to contact and actuate a switch 45 aswill be described below. Cam 4| is driven through its connection 53 withthe output shaft 4E of the upper reduction gear, which in turn is drivenfrom the lower reduction gear by driving means 41, which gear is drivenfrom the smaller motor 3 by a chain and sprocket connection.

At the front of the machine are provided switches 48 and 49, switch 4Bbeing connected with switch 45, as shown in Fig. 8, and switch 49 beingconnected with the larger motor 4.

Switch 43 controls the operation of the motor 4 which is 3 phase, 60cycle 220 volt by manual operation of said switch.

'I'he operation of the single motor 3 is controlled by automatic switch45 and manual switch 48. When the automatic switch 45 is in position Aswitch 48 is turned to position A to start motor #3. When the grindingcycle has been completed the arm 31 having an elbow 44 activatesautomatic switch 45 moving it into position B, thus, stopping the motor3. To start motor 3 again, it is necessary to manually operate switch 4Sby moving it to position B.

The operation of the machine is as follows:

Plates I9 and 2G are afiixed to cylinder l0 with their backs exposed, asshown in Fig. 2, by means of tapes 2|, 22 and tabs 23. The larger motor4 is started by manually throwing switch 49, which will rotate thegrinding roller 24 and the brush 3| at the same speed through meanspreviously described. Arm 31 is adjusted on shaft 9 with respect to cam4| so that when the arm roller 40 is in the depressed portion of thecam, the pointer 35 will show the thickness to which the plate will beground. At this point the switch 48 is actuated, which starts thesmaller motor 3 and rotates the cylinder I0 carrying the plates |9 andas well as rotating the S shaped cam 4|. As the cam turns it will beseen that the roller 40 riding on the cam surface Will raise the arm 31,which is clamped to shaft 9, and will advance the eccentric bearingcarrying cylinder |0 on shaft 9 toward the grinding roller 24. It willthus be seen that the surface to be ground is slowly advanced toward therotating grinding surface as the cylinder l0 and the cam 4| are rotated.The cam 4| is so shaped that during the latter several revolutions ofcylinder I0 prior to the completion of the grinding operation the roller4|] will ride on a"f1at on the cam 4|. This insures the completion ofthe grinding operation to the desired degree. When the roller reachesthe end of this fiat on the cam due to the continuous rotation of thelatter, the arm 31 will be pulled down into the low portion of the cam4| by means of spring 42 mounted as described above. This action of thearm 31 causes its elbow 44 to contact and actuate the switch 45. Thelatter being a double pole, double throw switch and beinginter-connected with switch 48 operates to stop the smaller motor 3which, as described above, serves to drive cylinder |0 and the cam 4|.The action of the arm will also serve to re-set the eccentric bearing toits starting position. The plates I9 and 20 having been ground to thedesired degree may now be removed from the cylinder I0 and trimmed foruse in a printing press. To stop the grinding roller 24 and the brush 3|it is necessary to throw the switch 49 manually.

Removable covers 50 and 5| may be provided for the front and back of themachine if desired and they are secured in any well know or approvedmanner to the castings and 2.

It will be understood that there are two sources of current supply, onefor each motor, the larger being a three phase motor, as shown in Fig.8.

It will also be understood that printing surfaces of printing plates mayalso be renished in this machine by adhering them with the printingsurface outward so that it may be contacted by the grinding rollersurface.

Since it is evident that various changes may be resorted to in theconstruction, form and arrangement of the several parts withoutdeparting from the spirit and scope of my invention, I do not intend tobe limited to the particular embodiment herein shown and describedexcept as set forth in the claims.

What I claim is:

1. A machine of the character described for grinding an objectcomprising, a rotatable grinding roller, a rotatable support for theobject to be ground, a gauge attached to said support for setting thegrinding depth, means for rotating the roller at one speed, other meansfor rotating the support at a lesser speed, eccentric bearings in saidsupport, an arm connected to said bearings, a switch controlling saidsupport rotating means, a projection on said arm in proximity to theswitch, a roller on said arm, a cam engaging said roller, cam drivingmeans, and a common frame for supporting said elements, the elementsbeing so constructed and arranged that when the gauged depth has beenattained the arm projection moves and actuates the switch to stop thesupport rotating and the cam driving means.

2. A machine of the character described for grinding an objectcomprising, a rotatable grinding roller, a rotatable support for theobject to be ground, a gauge attached to said support for setting thegrinding depthJ means for rotating the roller at one speed, other meansfor rotating the support at a lesser speed, eccentric bearings in saidsupport, an arm connected to said bearings, a switch controlling saidsupport rotating means, a projection on said arm in proximity to theswitch, a roller on said arm, and an S-shaped cam engaging said roller,means for driving said cam, a common support for all of said elements,the parts being so constructed and arranged that when the gauged depthhas been attained, the arm projection actuates the switch to stop therotating means for the support and said cam, the support being rotatedfor a period subsequent to the attainment of the grinding depth asdetermined by the shape of the cam surface engaging said roller beforethe roller arm projection actuates the switch to stop the supportrotating means.

3. A machine of the character described for grinding an objectcomprising a rotatable grinding roller, a rotatable support for theobject to be ground, means for rotating the roller, other means forrotating the support, and a third means for bringing the support intooperative relationship with a roller surface plus interconnectedcontrols for the support rotating means operable by a switch forcontrolling the support rotating means and including a driven cam, aroller riding thereon and an arm carrying said roller, said arm beingconnected to the support and carrying an element thereon between itsends 6 for actuating said controlling switch when the grinding operationhas been completed.

EARLE L. HARLEY.

References Cited in the le of this patent UNITED STATES PATENTS NumberName Date 341,581 Kirchner May 11, 1886 1,073,288 Robertson Sept. 16,1913 1,187,729 Hanson June 20, 1916 1,575,968 Bryant Mar. 9, 19261,627,983 Maickel May 10, 1927 1,651,501 Baker Dec. 6, 1927 1,884,293Schurr Oct. 25, 1932 2,028,315 Bruhl et al. Jan. 21, 1936 2,138,535Connor Nov. 29, 1938 2,321,383 Harper June 8, 1943

